...I've used them to repair about 5 tyres over the years. Always been perfect.

+1 on these, I've used for years and carry a kit in each of my vehicles, along with a CO2 inflator, can repair a flat and punctured tyre at the roadside in a couple of minutes and be on your way. Although these are labelled as "temporary" repairs, I've never had one fail and they can easily last for the remaining life of a tyre, although on the Zed, I'd probably get it "properly" repaired at a convenient time, when I used to rent out taxis, the drivers wouldn't bother and would carry on using the tyre with no ill effects.